Capture Textbox value through a CheckBox asp.net MVC

Question

There is a Form which consists of Textbox which are activated or deactivated by a CheckBox ....

How can I capture the value that the user enters validating that the Check is marked?

View

My View:

  <script type="text/javascript">
        $(function (){
            $("#idcheckproveedor").change(function(){
                var st = this.checked;
                if (st) {
                    $("#txtSearch").prop("disabled", false);
                }
                else {
                    $("#txtSearch").prop("disabled", true);
                }
                });
            });
    </script>

  <div class="form-group">
  <label>Proveedor</label>
  <input type="checkbox" id="idcheckproveedor" checked="checked" />
  @Html.TextBox("searchTerm", null, new { @class = "form-control", id = "txtSearch" })
 </div>

Answer 1

You can give a name to your checkbox element as the values would be posted as key value pair using the name attribute as key, so you can do following in view:

<input type="checkbox" name="AllowSearch" id="idcheckproveedor" checked="checked" />
@Html.TextBox("searchTerm", null, new { @class = "form-control", id = "txtSearch" })

and in action you will have for checkbox a parameter with name AllowSearch which will be of type bool to hold the either the checkbox was checked or not when posted:

[HttpPost]
public ActionResult BuscarRecepcion(string searchTerm, bool AllowSearch_
{ 

    // validate here 

    if(AllwoSearch)
    {
       // do search
    }

    // else send back to view as validation failed.

}